Wrench having a plurality of work engaging means



NOV. 28, 1967 R 3,354,756

WRENCH HAVING A PLURALITY OF WORK ENGAGING MEANS Filed April 18, 1966 Fig. 5'-

INVENTOR United States 3,354,756 WRENCH HAVENG A PLURALITY OF WORK ENGAGING MEANS Gerald R. Rush, 1152 E. Broadway, Maurnee, Ohio 43537 Filed Apr. 18, 1966, Ser. No. 543,364 2 Claims. (CI. 81-90) I ABSTRAQTE F THE DISCLOSURE A wrench for removing guide pins that are threaded into core boxes and the like, and which have become sufficiently frozen in the core boxes so that the normally used wrench engaging surfaces of the guide pins are no longer capable of transmitting sufficient torque to unthread the guide pins from the core boxes and the like.

The present invention relates to dowel pins which mate with bushings to align core boxes, molds, patterns, or other parts in a stacked relationship; and to wrenches for torquing the pins into threaded openings of the core boxes, molds, patterns, or other parts.

Core boxes are conventionally stacked on to pattern plates by means of mating pins and bushings and are thereafter filled with sand or resin containing compounds that become hard when the boxes are heated. The core boxes containing the mold material having half impressions of the pattern therein are lined and stacked with these same pins and bushings. The pins and bushings are conventionally provided with threaded shank portions which are screwed into threaded openings in the respective core boxes. The core boxes with the bushings and pins therein are heated to 500 F. or over to harden the mold material and may be stored in cold damp places when not in use. The result is that these pins and bushings become frozen in the core boxes after a period of time.

The pins and bushings of core boxes are subject to a considerable amount of wear and abrasion by reason of the sand or mold material which is always present. After a period of time therefore, it is necesary to replace the pins and the bushings. All of the pins with which I am familiar have either a cylindrical shank for pressing into the core boxes or a threaded shank for threading into the core boxes and include a flange on the outer end thereof with a pin or guide portion projecting outwardly of the flange. The pin or guide portion has a cylindrical sectionadjacent the flange and a tapered section outwardly of the cylindrical section for guiding a bushing onto the cylindrical centering section of the pin. One type of pin which has been used heretofore is shown in U.S. Kindt Patent 1,455,793 wherein the extreme end section of the projecting pin outwardly of the centering portion is provided with a square shape for the reception of a wrench for screwing the shank portion into a core box. The only way that these pins can be removed from their core boxes in a single piece is by applying torque to a wrench positioned on the polygonal section, and in a great many instances, the projecting pin portion is twisted off of the shank portion when the shank portion is frozen in a core box. Once the pin portion is twisted off, it is necessary to drill out or otherwise remove the shank portion. This procedure is not only time consuming and expensive, because the pins are usually quite hard, but in a great many instances, the core box is damaged.

Another type of pin which is commonly used is shown in the Kindt Patent 2,451,747. This construction of pin is generally similar to the pin above described excepting that the surfaces for reception of a wrench are formed by two notches in the sides of the flange. The flange of the pin fits into a counter bore in the top surface of the core ice box. These pins are torqued into and out of their threaded receiving openings in the core boxes 'by a wrench having a pair of axially extending tangs or projections which fit into the space formed by the sidewalls of the counter bore and the slotted openings of the flange. After a period of time, these wrench receiving openings become filled with a hard debris which make it impossible for good wrench engagement, and in other instances, these wrench receiving openings become worn and rounded by abrasion, so that the wrench slips out of these opening when an appreciable amount of torque is applied thereto. When this happens, it is necessary to cut off the pin and drill out the shank portion in a similar manner to that above described. If the pin has been hardened, it may be impossible to remove.

An object of the invention is the provision of a new i and improved guide pin having an extremely hard surface for increased life and which is provided with means which will make possible its removal from a core box when its normally used wrench engaging surfaces are damaged or are insufficient to effect removal.

Another object of the invention is the provision of a new and improved guide pin of the above described type having an opening through its guide portion adjacent the flange.

Another object of the invention is the provision of a i new and improved socket wrench constructed and arareprovided on the dowel 'pin to aid in its removal when ranged for use with guide pins of the immediately above described type and which in addition to conventional part gripping surfaces includes lateral openings for alignment with the above mentioned lateral opening in the guide p111.

Another object of the invention is the provision of a new and improved guide pin of the above described type which is not substantially weakened by the lateral opening therethrough.

A further object is the provision of a new and improved socket wrench having polygonal shaped external surfaces of a size and shape to receive an open end wrench and whereby additional torque can 'be applied to the pins.

A still further object of the invention is the provision of a new and improved wrench of the above described type which is not substantially weakened by the lateral openings therein.

The invention resides in certain constructions and com binations and arrangements of parts, and further objects and advantages will become apparent to those skilled in the art to which the invention relates, from the following description of several preferred embodiments described with reference to the accompanying drawing forming a part of this specification, and in which:

FIG. 1 is an elevational view of a guide pin for core boxes and the like, and which embodies principle of the present invention;

FIG. 2 is a plan view of the pin shown in FIG. 1;

FIG. 3 is an elevational View of a wrench embodying principles of the present invention and which is assembled to the guide pin of FIG. 1;

FIG. 4 is an elevational view similar to FIG. 3 but with portions broken away to better illustrate the internal detail of the wrench; and

FIG. 5 is a fragmentary sectional view through the dowel pin and dowel bushing of the invention when hooked together to align core boxes.

In order that dowel pins will have an extremely long life, it is proposed to harden dowel pins to a substantially nonmachinable condition. It is recognized that should the normally used wrench engaging surfaces become nonusable or broken off dowel pins thus hardened could not be drilled out of a core box without damage to the core box. According to the invention, second means .3 its normally used wrench engaging surfaces are insufficient for its removal. This second means preferably includes a lateral opening through the projecting pin portion of the dowel pinadjacent the flange of the dowel pin. The lateral opening is preferably formed before the dowel pin is heat treated to its substantially nonmachinable condition. Also according to the invention, a hardened wrench to be used with the dowel pin is also provided with openings arranged to align with the lateral opening through the dowel pin to receive projecting ends of a pin extending through the opening through the dowel pin.

The guide pin shown in the drawing generally comprises a cylindrically shaped shank 12 having a flange 14 at one end and external threads 16 on its other end for threaded engagement with a core box 18, a portion of which is shown in FIG. 5. The shank 12 may also include a cylindrical pilot bearing section 20 adjacent to flange 14. The guide pin 10 also includes an axially extending projecting pin portion 22 having a cylindrical bushing bearing surface 24, and an outer tapered guide section 26 for piloting or guiding the bushing on to the bearing section 24. The guide pin 10 also includes wrench receiving means which preferably includes both a portion 28 on the pin portion 22 and another portion 30 on the flange 14. The portion 28 of the wrench receiving means cornprises a polygonal shaped (usually square) section of the pin on the end of the tapered guide section 26. The portion 30 of the wrench receiving means comprises two or more notched out sections of the flange 14 to provide flat side surfaces 32 for abutment by a wrench. A lateral opening 34 is provided through the cylindrical bearing section 24 preferably located adjacent the flange 14 for reasons which will later be apparent.

The guide pin 10 is threaded into and removed from receiving openings in core boxes and the like by means of the wrench 36 shown in FIGS. 3 and 4. The wrench, shown, includes a tubular end portion 38 having an axially extending opening 40 therein for receiving the pin portion 22 of the guide pin 10. The opening 40 includes a cylindrical section 42, the sidewalls of which have a sliding fit with the cylindrical bearing section 24 of the guide pin 10.- The sidewalls also include a polygonal shaped section 44 which, in the present instance, is square and which have a sliding fit with respect to the polygonal shaped section 28 of the wrench receiving means of the guide pin 10. The sidewalls of the polygonal shaped section 44 will of course transmit torque to the portion 28 of the wrench receiving means. The lower end 46 of the wrench 36 is constructed and arranged to bear against the top surface of the flange 14 of the guide pin 10. The wrench 36 is also provided with tangs or projections 48 which project longitudinally from the lower surface 46, and which are in like number and arrangement with respect to the notches 30 in the flange 14, so that they can slide into the notches 30 and engage the side surfaces 32 when the sidewalls of the polygonal section 44 engage the wrench receiving means 28 of the guide pin 10. The radially outer surfaces 50 of the tangs 48 preferably do not extend radially outwardly of the radially outer surface of the flange 14. The wrench 36 also includes lateral openings 52 of a number and, arrangement to align with the opening 34 of the guide pin when the lower surface 46 of the Wrench 36 engages the upper surface of the flange 14. In the embodiment shown in the drawing, the openings 52 extend through the sidewalls of the wrench 36.

The guide pin 10 is threaded into the core box 18 by engagement of the polygonal shaped sidewalls of the section 44 of the opening 40 with the polygonal section 28 of the guide pin 10, or by the engagement of the tangs 48 with the abutment surfaces 32, and preferably both. During manufacture the guide pins 10 are provided with the configuration shown, and are thereafter hardened by heat treat to a condition which makes them substantially nonmachinable. If after insertion into a core box, the guide pin .10 should become frozen to a degree wherein suflicient driving engagement cannot be had between the wrench 36 and the wrench receiving means 28 and 30;

the wrench 36 can be positioned on the guide pin with its openings 52 aligned With the opening 34 of the guide pin, and a hardened drill rod or the like inserted therethrough. The openings 52 need not in all instances extend completely through the sidewalls of the wrench 36, but may in some instances, be portions of slots communicating with the end surface 46 of the wrench for receiving a short section of pin that extends outwardly of the cylindrical bearing section 24 of the pin.

The construction so far described, can be used with guide pins having cylindrical bearing sections 24 that are not joined to the flange 14 by means of the fillet 54 shown in the drawing. The openings 34 and 52 may be spaced outwardly from the top surface of the flange 14 and the end 46 of the wrench, respectively. This will allow sufiicient metal in the wrench between the openings 52 and the end surface of the wrench to transmit stress around the opening. In the preferred embodiment, however, the openings 52 are positioned above the tangs 58 to further increase the amount of metal in the wrench capable of transmitting stress around the openings 52. Where the openings 52 are positioned over the tangs 48 and the tangs are provided with sufiicient width, the openings 34 in the guide pins 10 can be positioned very closely adjacent the top surface of the flange 14 to thereby increase the amount of torque which can be transmitted from the pin portion 22 to the shank portion 12. In the most preferred construction, a fillet 54 is provided at the juncture between the pin portion 22 and the flange 14, and opening 34 is positioned closely adjacent the flange 14 so as to pass through part of the fillet 54, and thereby further increase the amount of torque. which can be transmitted by a pin in the opening 34 to the shank portion 12.

While the invention has been described with considerable detail, I do not Wish to be limited to the particular embodiment shown and described; and it is my intention to cover hereby, all novel adaptations, modifications, and arrangements thereof which come within the practice of those skilled in the art to which the invention relates, and which come within the scope of the following claims.

I claim:

1. A wrench for rotating a guide pin being threadingly engageable with a core box, comprising an elongate body member, said body member having a T-shaped handle at one end and a generally tubular portion at the other end, said tubular portion having several means thereon to independently and cooperatively apply a torque on said guide pin, said means include at least one tang extending longitudinally from the wall of the tubular portion to engage a complementary portion of the guide pin, aligned lateral apertures in the wall of the tubular portion located for alignment with a transverse aperture in the guide pin for receiving a torque pin therethrough, said lateral apertures being spaced longitudinally inwardly from the end of the tubular portion from which said tang projects, and a polygonal shaped guide pin receiving surface on the internal wall of the tubular portion to nonrotatably lock on a polygonal portion of the guide pin.

2. The wrench of claim 1 in which said tubular portion has an external polygonal shaped wrench receiving surface.

References Cited UNITED STATES PATENTS 737,902 9/1903 Brattlof 81121.1 1,394,539 10/1921 Danielson 8l-121.1 1,455,793 5/1923 Kindt 22-1 10 2,451,747 10/ 1948 Kindt 8 l90.5

FOREIGN PATENTS 671,087 4/ 1952 Great Britain.

OTHELL M. SiMiSON, Primary Examiner.

G. WEIDENFELD, Assistant Examiner. 

1. A WRENCH FOR ROTATING A GUIDE PIN BEING THREADINGLY ENGAGEABLE WITH A CORE BOX, COMPRISING AN ELONGATE BODY MEMBER, SAID BODY MEMBER HAVING A T-SHAPED HANDLE AT ONE END AND A GENERALLY TUBULAR PORTION AT THE OTHER END, SAID TUBULAR PORTION HAVING SEVERAL MEANS THEREON TO INDEPENDENTLY AND COOPERATIVELY APPLY A TORQUE ON SAID GUIDE PIN, SAID MEANS INCLUDE AT LEAST ONE TANG EXTENDING LONGITUDINALLY FROM THE WALL OF THE TUBULAR PORTION TO ENGAGE A COMPLEMENTARY PORTION OF THE GUIDE PIN, ALIGNED LATERAL APERTURES IN THE WALL OF THE TUBULAR PORTION LOCATED FOR ALIGNMENT WITH A TRANSVERSE APERTURE IN THE GUIDE PIN FOR RECEIVING A TORQUE PIN THERETHROUGH, SAID LATERAL APERTURES BEING SPACED LONGITUDINALLY INWARDLY FROM THE END OF THE TUBULAR PORTION FROM WHICH SAID TANG PROJECTS, AND A POLYGONAL SHAPED GUIDE PIN RECEIVING SURFACE ON THE INTERNAL WALL OF THE TUBULAR PORTION TO NONROTATABLY LOCK ON A POLYGONAL PORTION OF THE GUIDE PIN. 